Grease trap



G. J. DEHN May 28, 1935.

GREASE TRAP Filed May 29, 1930 Patented May 28, 1935 UNITED STATES-PATENT OFFICE i 3 Claims.

The invention relates generally to grease traps. More particularly theinvention relates to that type of trap which comprises a basin throughwhich drainage is adapted to pass, and operates to collect or segregatethe grease so that the latter will not pass from the basin with theremainder of the drainage.

One object of the invention is to provide a grease trap of this typewith improved means for cooling the drainage to congeal the grease inthe trap.

Another object of the invention is to provide an improved grease trapwhichv is composed of parts which can bereadily assembled and separated.

Other objects of the invention will appear from the detaileddescription. Y

The invention consists in the several novel features hereinafter setforth and more particularly defined by claims at the conclusion hereof.

In the drawing: Fig. I is a sectional perspective of a greasetrapembodying the invention. Fig. 2 is a section taken on line 2-2 of Fig.1.

The invention is exemplified in a trap comprising a receptacle or basin3 which is formed with a cylindrical wall 4, an integral bottom wall 5and a top 6 which is removably secured by bolts 1 to the basin and formsa top closure. lAn annular ange 8 is formed at the upper end of the wall4 and an annular rib 9, integral with the top 6, ts around the ange 8.The chamber 3n in the basin is adapted to receive drainage through aconnection comprising an inlet pipeY I0 which is screw-threaded into theouter end of a bushing II which is secured in a boss I2 which projectsfrom, and is integral with, the wall d of the basin; a nipple I3, whichis screwthreaded into the inner end of the lbushing I I; an elbow I4,the horizontal member of which is screw-threaded onto the inner end ofthe nipple I3; and a pipe I5 which is screwthreaded into the downwardlyextending member of the elbow I4. Nipple I3 is provided with right andleft-hand screw-threads, and bushing II and elbow I4 arecorrespondinglythreaded so that by turning the nipple I3 the elbow I4 and bushing I Iwill be drawn together and secured in place without rotating the elbowrelatively to the bushing. This construction permits the elbow and pipeI5 to be assembled before they are inserted in the basin, and alsopermits them to be removed by turning the nipple I3.

An outlet connection for the drainage is provided. 'I'his connection issimilar in construction to the inlet connection, and comprises adischarge pipe I 5 which is screw-threaded into a bushing il which iscast in a boss I 8 which is integral with the side wall 4; a nipple I 9having its outer end threaded into the inner 5 end of bushing II, anelbow 20 which is threaded onto the inner end of nipple I9; and avertical pipe ZI which is screw-threaded into the downwardly extendingmember of the elbow 20. Nipple I9 is provided with right and leftthreads 10 for engaging corresponding threads on the bushing I7 andelbow 2S to permit said Velbow to be connected or disconnected from thebushing I1. The lower ends of pipes I5 and 2I are open to discharge andreceive drainage respectively. 15 Each of the elbows I4 and 2|) isprovided with a clean-out plug 22 which permits, when removed, acleaning device to be passed through the pipes I5 and I6 in event anydeposits should accumulate therein. 20

A vent pipe 23 is connected to the top 6. Said top is formed with a handhole 24 which is normally closed by a cap 25 which is removably held toclose the hole by a saddle 26 and a screw 21. The Vsaddle engages lugs25 28 on the top 6. By loosening the screw and turning the saddle, thecap may be removed to provide access to the chamber in the basin.

The improved cooling means comprises a hollow structure or jacket whichis adapted to fit 30 in the lower portion of the basin and is chamberedto permit cooling water to circulate therethrough. This jacket comprisesa cylindrical outer wall 30 which substantially fits the inner peripheryof the basin; an inner cylindrical 35 wallr3I, cross walls 32 and 33 anda bottom wall 39 and a top'wall 4D. Said top and bottom walls extendbetween the outer cylindrical wall 36 and the inner cylindrical wall 3|,and between cross walls 32 and 33, so that the cool- 40 ing liquid willbe confined to the chambers between said walls. An inlet pipe 34 forcooling liquid extends through wall 4 of the basin, and has a taperedthread engaging a thread in said wall and extends through and isthreaded into 45 the outer wall 30 of the jacket for the cooling liquid.Cross wall 33 is extended across the chamber in the jacket adjacent pipe34, so that the cooling water will pass through the semicircular chamber35 in the jacket and around 50 one side thereof to the chamber 36between walls 32 and 33. Wall 32 is extended at the end of semi-circularchamber 35 to the outer wall 30 of the jacket, so that the water willpass from chamber'v 33 across the basin, and 55 f, of the grease;

thence into a semi-circular chamber 3'! which communicates with theVother end of chamber 36 and conducts the cooling water to the dischargepipe 38 which extends through and is threaded to the wall i! of thebasin and also to the wall 30 of the jacket. This construction forms awater jacket with a passage for the water, whereby it is caused tocirculate around the outside of and across the basin in its flow fromthe inlet pipe 3d to the outlet pipe 33, and also forms a bale overwhich the drainage must flow in passing from the inlet pipe i5 to theoutlet pipe 2l.

In operation the drainage entering pipe i0 will be deflected downwardlyby elbow i4 and discharged through the lower end of pipe l5 into thechordal-chamber between walls 3i and 33 of the jacket ior the coolingliquids. In this compartment the drainage will be sub'ected to thecooling inuenoe of the water-jacket and its flow will be interrupted bythe baflie torming a part of the water jacket, so that the grease willbe separated from the water and pass to the top or the water columnusually maintained in the The drainage passing over the baile will enterthe ychordal chamber at the discharge side of the baille, and passupwardly through pipe 2l, elbow Zil, nipple i9, and pipe E5 to thesewer. The coolingliquid enters the inlet pipe 3f?, and passes aroundlthe semi-circular chamber at one side of the water jacket, then acrossthe baiTie and then around the other semi-circular chamber to thedischarge connection. The sinuous course or the cooling liquid,

j' caused by this formation of the jacket and baille,

drainage to be erlithe grease from the causes all portions of theciently cooled to separate drainage.

The trap described exemplifies one in which la circular cooling jacketis separately formed from the basin and removably held therein; in whichthe cooling liquid is caused to circulate around and across the drainagechamber to eiiiiciently cool the drainage for the separation in whichthe inlet and outlet conneetions are composed of parts whichvcan beeasily mounted in the basin and removed therefrom; which is efficient inoperation and which con be produced at a low cost.

The invention is not to be understood as restricted to the details setforth, since these may be modified within the scope of the appendedwithout departing from the spirit and sco; of the invention.

Having thus described the invention, what I claim as new and desire tosecure by `Letters Patent, is: v

l. In a grease trap of the combination of a basin,

the character described, inlet and outlet :connections for drainagethrough the basin, an

annular, drainage cooling jacket in the lower end oi the basin adaptedto have a cooling medium circuiated therethrough and embodyingsemicircular chambers and a cross chamber con-I necting thesemi-circular chambers and an in-V let and an outlet for the coolingmedium' 'semi-circular chambers to cause flow connected to thesemi-circular chambers at the ends which are remote from the points ofthe connections between the cross chamber and the the medium tosuccessively through said chambers.

2. In a grease trap of the character described, the combination of abasin provided with a removable top, means for passing drainage throughthe basin comprising horizontally extending inlet and outlet pipesoutside of the basin, a pair of vertically extending, laterally spacedpipes in the basin, and a pair of hori- 1 Zontal nipples extendingthrough the side wall of the basin and between the inlet and outletpipes and the upper ends of the vertically extending pipes in the basinand serving to space the vertically extending pipes from the side Ywallof the basin and to permit of removal of said vertically extendingpipes, and means for cooling the drainage during passage thereof throughthe basin so as to congeal the grease,v

consisting of a jacket disposed in the lower end andorme separatelyfromthe basin and having a continuous chamber about the side wallA ofthe basin and around the lower ends of the vertically extending pipes ofthe drainage-` passing means, and pipe-connections extending through thebasin and adapted to circulate a cooling medium through the chamber,said jacket removable through the top of the repair or replacementpurposes upon removal of said vertically extending pipes anddisconnection of the pipe-connections.

3. In a grease trap of the character described.' the combination of acylindrical basin provided with a removable top, means for passingdrainage through the basin comprising extending inlet and outlet pipesoutside of the basin, a pair of vertically spaced pipes in the basin,and a pair of horio the basin and between the inlet and outlet pipes andthe upper ends of the vertically extending pipes the verticallyextending pipes from the side wall of the basin and to permit of removalof said vertically extending pipes, and means for cooling the drainageduring through the basin so as to congeal the grease, consisting of ajacket disposed in the lower end of and formed separately from the basinand embodying an annular chamber extending a cooling medium through theannular chamber, said jacket being removable through the top of thebasin for repair or replacement pur-ky basin for horizontally extending,laterally in the basin and serving to space passage thereof about' theinner face of the side wall of the basin andA around the lower ends ofthe vertically extending pipes, and a baille separating the lower endsof said vertically extending pipes and extending' across the spacewithin the annular chamben and pipe-connections extending through theSide wall of the. basin and adapted to circulate 4052 Zontal nipplesextending through the side Wall-

